CN110905466B - A method for increasing production and improving oil recovery of biological nanoemulsion - Google Patents
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- 239000007908 nanoemulsion Substances 0.000 title claims abstract description 65
- 238000011084 recovery Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 238000009826 distribution Methods 0.000 claims abstract description 3
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000000638 stimulation Effects 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 73
- 239000010779 crude oil Substances 0.000 description 10
- 230000035699 permeability Effects 0.000 description 8
- 239000003623 enhancer Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011549 displacement method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
Description
技术领域technical field
本发明属于生物与石油开采技术领域，具体涉及一种利用生物纳乳技术驱油，实现油井增产和提高采收率的方法。The invention belongs to the technical field of biological and petroleum exploitation, and in particular relates to a method for oil displacement by utilizing biological nanoemulsion technology to realize oil well production increase and recovery ratio.
背景技术Background technique
通过流体驱替方法，从含油岩心、地层或油藏等含油多孔介质中采出石油，是驱油研究和石油开采过程中的重要方法，多年来备受关注。Oil production from oil-bearing porous media such as oil-bearing cores, formations or reservoirs by fluid displacement method is an important method in oil displacement research and oil recovery process, and has attracted much attention for many years.
目前，全球探明的石油储量超过1万亿吨，通过酸化、压裂、水驱、聚合物驱、表面活性剂驱、碱水驱及各种物理场方法，可以采出约30~40%的原油，但仍然有60~70%以上的原油无法采出。如何提高石油采收率，一直是世界范围内面临的难题。At present, the world's proven oil reserves exceed 1 trillion tons. Through acidification, fracturing, water flooding, polymer flooding, surfactant flooding, alkaline water flooding and various physical field methods, about 30~40% of the oil can be recovered. of crude oil, but still more than 60-70% of the crude oil cannot be recovered. How to improve oil recovery has always been a problem faced by the world.
我国已成为全球第一石油消费国，每年消耗原油6.5亿吨以上，其中国内产油量不足2亿吨，大量原油依赖进口。常规采油技术在油井增产和提高采收率方面发挥了重要作用。但是，随着油藏的开采，大量油井经水驱后进入高含水期，油水通道相对稳定，大量残余油难以驱动，使得油井的稳产和增产难度大，进一步提高采收率面临严峻挑战。因此，研发创新的石油增产和提高采收率方法，具有十分重要的战略意义。my country has become the world's largest oil consumer, consuming more than 650 million tons of crude oil every year, of which domestic oil production is less than 200 million tons, and a large amount of crude oil is imported. Conventional oil recovery technology has played an important role in oil well stimulation and enhanced oil recovery. However, with the development of oil reservoirs, a large number of oil wells enter the high water cut period after water flooding, the oil-water channel is relatively stable, and a large amount of residual oil is difficult to drive. Therefore, it is of great strategic significance to develop innovative methods of oil stimulation and enhanced oil recovery.
发明内容SUMMARY OF THE INVENTION
针对现有技术中存在的上述问题，本发明目的是提供一种利用生物纳乳从含油多孔介质中驱油，进而实现增产和提高采收率的方法。In view of the above problems existing in the prior art, the purpose of the present invention is to provide a method for utilizing biological nanoemulsion to drive oil from oil-containing porous media, thereby realizing production increase and enhanced oil recovery.
所述的一种生物纳乳增产和提高采收率的方法，其特征在于以生物纳乳为水相增产剂，将生物纳乳注入含油多孔介质，在多孔介质内改变油水界面形状和残余油微观分布状态，进行水相驱油，促进油相流动，使油相随生物纳乳流出多孔介质进行采出和回收，实现油相产量和采收率的提高。The method for increasing production and improving oil recovery of biological nanoemulsion is characterized in that the biological nanoemulsion is used as the water phase production increasing agent, and the biological nanoemulsion is injected into the oil-containing porous medium, and the shape of the oil-water interface and the residual oil are changed in the porous medium. The micro-distribution state, water-phase oil displacement, promotes the oil-phase flow, makes the oil-phase flow out of the porous medium with the biological nanoemulsion for recovery and recovery, and realizes the improvement of oil-phase production and recovery.
所述的生物纳乳增产和提高采收率的方法，其特征在于生物纳乳为液滴尺寸在纳米量级的生物基乳状液。The method for increasing production and improving oil recovery of biological nanoemulsion is characterized in that the biological nanoemulsion is a biological-based emulsion whose droplet size is in nanometer order.
所述的生物纳乳增产和提高采收率的方法，其特征在于生物纳乳为BioNanoEM系列生物纳乳。The method for increasing production and improving oil recovery of biological nanoemulsion is characterized in that the biological nanoemulsion is BioNanoEM series biological nanoemulsion.
所述的生物纳乳增产和提高采收率的方法，其特征在于包括以下步骤：The method for increasing the production of biological nanoemulsion and improving the oil recovery is characterized by comprising the following steps:
1）将生物纳乳搅拌或按一定浓度在水中稀释后搅拌，形成均匀的生物纳乳液；1) Stir the biological nano-emulsion or dilute it in water at a certain concentration and stir to form a uniform biological nano-emulsion;
2）将步骤1）的生物纳乳液注入含油多孔介质或经注水驱替后含有残余油的多孔介质进行驱替，使油相随生物纳乳液流出多孔介质；2) The biological nanoemulsion of step 1) is injected into the oil-containing porous medium or the porous medium containing residual oil after water flooding for displacement, so that the oil phase flows out of the porous medium with the biological nanoemulsion;
3）收集流出液，静置油水分层，回收油相。3) Collect the effluent, let the oil-water layer stand still, and recover the oil phase.
所述的生物纳乳增产和提高采收率的方法，其特征在于步骤1）中生物纳乳液的质量百分比浓度为0.1~100%。The method for increasing production and improving oil recovery of biological nanoemulsion is characterized in that the mass percentage concentration of biological nanoemulsion in step 1) is 0.1-100%.
所述的生物纳乳增产和提高采收率的方法，其特征在于步骤2）中的生物纳乳液的用量为多孔介质孔隙总体积的0.2~8倍，生物纳乳液注入多孔介质的流速为0.02~0.12 cm/min。The method for increasing production and improving oil recovery of biological nanoemulsion is characterized in that the dosage of biological nanoemulsion in step 2) is 0.2-8 times of the total pore volume of the porous medium, and the flow rate of the biological nanoemulsion injected into the porous medium is 0.02 ~0.12 cm/min.
通过采用上述技术，与现有技术相比，本发明具有如下有益效果：By adopting the above-mentioned technology, compared with the prior art, the present invention has the following beneficial effects:
（1）本发明提供的生物纳乳增产和提高采收率的方法，与传统利用界面张力改变、地层润湿性反转或驱替液流动特性改进等方法不同。本发明是通过生物纳乳在残余油界面的富集改变界面形状，使进残余油液滴变形，进而利用水驱剪切拉动，随水相流动而采出，从而实现增产和提高采收率的目的；(1) The method for increasing the production of biological nanoemulsion and improving the oil recovery provided by the present invention is different from the traditional methods using the change of interfacial tension, the reversal of formation wettability or the improvement of the flow characteristics of displacement fluid. The invention changes the interface shape through the enrichment of biological nanoemulsion at the residual oil interface, so that the incoming residual oil droplets are deformed, and then the water drive is used for shearing and pulling, and the production is produced with the flow of the water phase, thereby realizing production increase and improved recovery rate. the goal of;
（2）本发明提供的生物纳乳增产和提高采收率的方法，在常规注水驱替至残余油状态，产水率达100%时，仍然可以从含油多孔介质中继续产出油相，因此，增产和提高采收率效果显著；(2) In the method for increasing production and improving oil recovery of biological nanoemulsion provided by the present invention, when the conventional water flooding is displaced to the residual oil state and the water production rate reaches 100%, the oil phase can still be produced from the oil-bearing porous medium, Therefore, the effect of increasing production and improving oil recovery is significant;
（3）本发明采用的生物纳乳增产剂，具有优良的生物安全性，可生物降解，对环境无污染，安全环保；(3) The biological nanoemulsion production enhancer used in the present invention has excellent biosafety, is biodegradable, does not pollute the environment, and is safe and environmentally friendly;
（4）本发明提供的生物纳乳驱油方法，其步骤简单，工业放大容易，工程应用方便，增产和提高采收率效果显著，可以实现大规模应用，在能源和石油开采领域具有广阔的应用前景。(4) The biological nanoemulsion oil displacement method provided by the present invention has the advantages of simple steps, easy industrial scale-up, convenient engineering application, remarkable effect of increasing production and improving oil recovery, can realize large-scale application, and has broad application in the fields of energy and oil exploitation. application prospects.
具体实施方式Detailed ways
下面结合具体实施例对本发明作进一步说明，但本发明的保护范围并不限于此。The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.
实施例1Example 1
取孔隙率20%、水渗透率110 mD的含原油多孔介质，注水驱替至产水率上升至100%，残余油饱和度为30.1%、含水饱和度为69.9%，采收率为43%；将质量百分比浓度为100%的BioNanoEM生物纳乳增产剂（即纯的BioNanoEM生物纳乳）搅拌均匀，制成生物纳乳液，于流速为0.04 cm/min下注入含油多孔介质（前面所述的孔隙率20%、水渗透率110 mD的含原油多孔介质）进行驱替，注入总量为1.5倍孔隙体积；驱替过程中油相随生物纳乳液流出多孔介质；收集流出液，待油水分层，回收油相；测得油相产率为0.06~0.12 t/h/m3多孔介质，采收率为53%，提高10%。Taking a crude oil-bearing porous medium with a porosity of 20% and a water permeability of 110 mD, water flooding was performed until the water production rate rose to 100%, the residual oil saturation was 30.1%, the water saturation was 69.9%, and the recovery rate was 43% ; Stir the BioNanoEM biological nanoemulsion increasing agent (that is, pure BioNanoEM biological nanoemulsion) with a concentration of 100% by mass to make a biological nanoemulsion, and inject it into the oil-containing porous medium (described above) at a flow rate of 0.04 cm/min. The oil-containing porous medium with a porosity of 20% and a water permeability of 110 mD) was flooded, and the total injection volume was 1.5 times the pore volume; during the displacement process, the oil phase flowed out of the porous medium along with the biological nanoemulsion; the effluent was collected, and the oil and water were separated. , the oil phase was recovered; the oil phase yield was measured to be 0.06-0.12 t/h/m 3 porous medium, and the recovery rate was 53%, an increase of 10%.
实施例2Example 2
取孔隙率20%、水渗透率110 mD的含原油多孔介质，注水驱替至产水率上升至100%，残余油饱和度为38%、含水饱和度62%，采收率为40%；将BioNanoEM生物纳乳增产剂在水中稀释，搅拌均匀，制成0.1%的生物纳乳液；于流速0.08 cm/min下注入含油多孔介质（孔隙率20%、水渗透率110 mD的含原油多孔介质）进行驱替，注入总量为1.5倍孔隙体积；驱替过程中油相随生物纳乳液流出多孔介质；收集流出液，待油水分层，回收油相；测得油相产率为0.024~0.036 t/h /m3多孔介质，油相采收率为42%，提高2%。Taking a crude oil-bearing porous medium with a porosity of 20% and a water permeability of 110 mD, the water flooding was performed until the water production rate rose to 100%, the residual oil saturation was 38%, the water saturation was 62%, and the recovery rate was 40%; The BioNanoEM biological nanoemulsion production enhancer was diluted in water and stirred evenly to make a 0.1% biological nanoemulsion; it was injected into an oil-containing porous medium (porosity 20%, water permeability 110 mD crude oil-containing porous medium at a flow rate of 0.08 cm/min) ) for displacement, and the total injection amount is 1.5 times the pore volume; during the displacement process, the oil phase flows out of the porous medium along with the biological nanoemulsion; the effluent is collected, and the oil phase is recovered after the oil and water are separated; the measured oil phase yield is 0.024~0.036 t/h/m 3 porous media, the oil phase recovery rate is 42%, an increase of 2%.
实施例3Example 3
取孔隙率20%、水渗透率110 mD的含原油多孔介质，注水驱替至产水率上升至100%，残余油饱和度为38.2%、含水饱和度61.8%，采收率为39.9%；取不同量的BioNanoEM生物纳乳增产剂分别在水中稀释、搅拌均匀，制成0.1%、0.5%及100%的生物纳乳液；于流速0.02~0.12 cm/min下，将0.1%、0.2%、100%和0.1%的生物纳乳液依次注入含油多孔介质（孔隙率20%、水渗透率110 mD的含原油多孔介质）进行驱替，注入量分别为2.1倍、2.1倍、1.5倍和2.3倍孔隙体积，共注入8倍孔隙体积的生物纳乳液；驱替过程中油相随生物纳乳液流出多孔介质；收集流出液，待油水分层，回收油相；测得油相产率为0.02~0.12 t/h /m3多孔介质，油相采收率为61.9%，提高22%。Taking a crude oil-bearing porous medium with a porosity of 20% and a water permeability of 110 mD, the water flooding was performed until the water production rate rose to 100%, the residual oil saturation was 38.2%, the water saturation was 61.8%, and the recovery rate was 39.9%; Dilute different amounts of BioNanoEM biological nanoemulsion production enhancer in water and stir evenly to prepare 0.1%, 0.5% and 100% biological nanoemulsion; 100% and 0.1% biological nanoemulsion were sequentially injected into the oil-bearing porous medium (the crude oil-bearing porous medium with a porosity of 20% and a water permeability of 110 mD) for displacement, and the injection amount was 2.1 times, 2.1 times, 1.5 times and 2.3 times, respectively. pore volume, a total of 8 times the pore volume of the biological nanoemulsion was injected; during the displacement process, the oil phase flowed out of the porous medium with the biological nanoemulsion; the effluent was collected, and the oil phase was recovered after the oil and water were separated; the measured oil phase yield was 0.02~0.12 t/h/m 3 porous medium, the oil recovery rate is 61.9%, an increase of 22%.
实施例4Example 4
取孔隙率19.3%、水渗透率93 mD的含原油多孔介质，注水驱替至产水率上升至100%，残余油饱和度为32.6%、含水饱和度67.3%，采收率为43.2%；取BioNanoEM生物纳乳增产剂搅拌均匀，制成质量百分比浓度100%的生物纳乳液；于流速0.03~0.12 cm/min下，将100%的生物纳乳液依次注入含油多孔介质（孔隙率19.3%、水渗透率93 mD的含原油多孔介质）进行驱替，注入量0.2倍孔隙体积；驱替过程中油相随生物纳乳液流出多孔介质；收集流出液，待油水分层，回收油相；测得油相产率为0.01~0.04 t/h /m3多孔介质，油相采收率为47.4%，提高4.2%。Taking a crude oil-bearing porous medium with a porosity of 19.3% and a water permeability of 93 mD, water flooding was performed until the water production rate rose to 100%, the residual oil saturation was 32.6%, the water saturation was 67.3%, and the recovery rate was 43.2%; Take the BioNanoEM biological nanoemulsion production enhancer and stir evenly to prepare a biological nanoemulsion with a mass percentage concentration of 100%; at a flow rate of 0.03-0.12 cm/min, 100% of the biological nanoemulsion was sequentially injected into the oil-containing porous medium (porosity 19.3%, The oil-containing porous medium with a water permeability of 93 mD) was displaced, and the injection amount was 0.2 times the pore volume; during the displacement process, the oil phase flowed out of the porous medium along with the biological nanoemulsion; the effluent was collected, and the oil phase was recovered after the oil and water were separated. The oil phase production rate is 0.01~0.04 t/h/m 3 porous medium, and the oil phase recovery rate is 47.4%, an increase of 4.2%.
本说明书所述的内容仅仅是对发明构思实现形式的列举，本发明的保护范围不应当被视为仅限于实施例所陈述的具体形式。The content described in this specification is only an enumeration of the realization forms of the inventive concept, and the protection scope of the present invention should not be regarded as being limited to the specific forms stated in the embodiments.
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